JPH0525350U - Analyzer - Google Patents

Abstract

(57) [Summary] [Objective] The present invention prevents a measurement error from occurring even if a solid matter or air bubbles are mixed in the sample liquid. [Constitution] Based on the detection result of the resistance measuring electrode 4 provided at the front stage of the sensor 3 and the detection result of the resistance measuring electrode 5 provided at the rear stage of the sensor 3, the CPU 6 determines whether the measurement result of the sensor 3 is good or bad. Judgment is made and only the good portion is output as the measurement result.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an analyzer used when performing liquid analysis and the like.

[0002]

[Prior Art]

 For electrode type analyzers such as PH meters and conductivity meters, those that insert sensors into process piping lines for automatic measurement and colorimetric and other measurements such as flow injection method Things are being developed.

FIG. 3 is a block diagram showing an example of such an analyzer.

The analyzer shown in this figure has a pump 101 for taking in a liquid to be measured (sample liquid), a test liquid flow passage 102 to be a flow passage for the sample liquid taken in by this pump 101, and A sensor 103 which is attached to the test liquid flow path 102 and measures the pH and the like of the sample liquid, and a measurement result obtained by the sensor 103 is amplified and output to a recorder or display for recording or displaying. It is equipped with an analyzer main body 104, and while the pump 101 is driven to take in the sample liquid, the pH of the sample liquid is measured by the sensor 103 and the measurement result is recorded in the recorder. , Display on the display.

[0005]

[Problems to be solved by the device]

 However, in the conventional analyzer described above, if foreign matter is mixed in the sample solution, it will hinder the measurement. Therefore, a filter or the like is provided on the upstream side (front side) of the sensor 103 to prevent the foreign matter from mixing. I'm out.

However, with such a method, although solid matter in the sample liquid can be removed, bubbles and the like cannot be removed, so that a measurement error occurs due to the bubbles and the like mixed in the sample liquid. There was something that happened.

In view of the above circumstances, the present invention has an object to provide an analyzer capable of preventing a measurement error even if a solid matter, air bubbles, or the like is mixed in a sample liquid. There is.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the analyzer according to the present invention is an analyzer that takes in a liquid and measures the measurement items preset by the sensor. Of the measurement error cause item of the preceding stage, and the latter stage detector which is provided in the latter stage of the sensor and measures the cause item of the measurement error of the liquid flowing out from the sensor, the detection result of the preceding stage detector and the above It is characterized by comprising a control circuit for judging the quality of the measurement result of the sensor based on the detection result of the latter-stage detector and outputting only the good portion as the measurement result.

[0009]

[Action]

 In the above configuration, the control circuit determines whether the measurement result of the sensor is good or bad based on the detection result of the front stage detector provided in the front stage of the sensor and the detection result of the rear stage detector provided in the rear stage of the sensor. It is judged and only the good part is output as the measurement result.

[0010]

【Example】

 FIG. 1 is a block diagram showing an embodiment of the analyzer according to the present invention.

The analyzer shown in this figure has a pump 1 for taking in a liquid (sample liquid) to be measured, a test liquid flow passage 2 for being a flow passage for the sample liquid taken in by the pump 1, A sensor 3 which is attached to the liquid flow path 2 and measures the pH and the like of the sample liquid, and a conductivity of the sample liquid which is provided in front of the sensor 3 of the test liquid flow path 2 and is guided to the sensor 3. A resistance measuring electrode 4 for measuring the conductivity, and a resistance measuring electrode 5 for measuring the conductivity of the sample liquid discharged from the sensor 3, which is provided after the sensor 3 in the test liquid flow path 2. The CPU 6 determines whether or not the sample liquid contains bubbles or the like based on the measurement results of the resistance measuring electrodes 4 and 5, and the CPU 6 determines whether the sample liquid contains bubbles or the like. Determined to be In this case, the analyzer main body 7 is provided for amplifying the measurement result obtained by the sensor 3 and outputting the amplified result to a recorder or a display device for recording or displaying.

Next, the measurement operation of this embodiment will be described with reference to the configuration diagram shown in FIG.

First, when a measurement command such as PH of the sample liquid is input, the CPU 6 drives the pump 1 to take in the sample liquid and allow it to flow into the test liquid flow path 2 while measuring two resistances. The conductivity of the sample liquid is measured by the electrodes 4 and 5 to determine whether the resistance value of the sample liquid is smaller than a preset value.

Then, if the resistance value of the sample liquid measured by each of the resistance measuring electrodes 4 and 5 is smaller than a preset value, the CPU 6 causes bubbles in the sample liquid supplied to the sensor 3. And the like, the pump 1 is continuously driven to supply the sample liquid to the sensor 3, while an output command is supplied to the analyzer main body 7 to obtain the sample liquid. The measured results are amplified and output to a recorder or a display device to record or display the measured results.

Further, in this state, if the resistance value of the sample liquid measured by the resistance measuring electrode 4 provided in the preceding stage of the sensor 3 is preset and becomes equal to or more than the value, the CPU 6 causes the It is judged that the resistance value has dropped due to the inclusion of bubbles in the sample liquid supplied to the sensor 3, and the generation of the output command is stopped to prevent the analyzer main body 7 from outputting an incorrect measurement result. ..

After that, the sample liquid containing bubbles and the like passes through the sensor 3 portion and reaches the resistance measuring electrode 5 portion provided on the rear side of the sensor 3, and the resistance measuring electrode 5 When the resistance value of the sample liquid obtained as a result becomes equal to or higher than a preset value, the CPU 6 determines that the sample liquid containing the bubbles and the like has completely passed through the sensor 3 portion, and generates the output command. To resume.

As a result, the analyzer body 7 resumes its operation, amplifies the measurement result obtained by the sensor 3, and outputs it to a recorder or a display to record or display the measurement result. I will let you.

As described above, in this embodiment, when bubbles or the like that cause a measurement error are mixed in the sample liquid, this is detected by the resistance measuring electrode 4 provided in the preceding stage of the sensor 3. The operation of the analyzer main body 7 is stopped, thereby preventing an incorrect measurement result from being output, and thereafter, the resistance measuring electrode 5 provided on the rear side of the sensor 3 causes the sample liquid containing the bubbles and the like to be output. Since the operation of the analyzer main body 7 is restarted when the passage of the sample is detected, it is possible to prevent a measurement error even if a solid matter or air bubbles are mixed in the sample solution. it can.

FIG. 2 is a block diagram showing another embodiment of the analyzer according to the present invention. In this figure, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

The analyzer shown in this figure has a pump 1 for taking in a liquid (sample liquid) to be measured, a test liquid flow passage 2 for being a flow passage for the sample liquid taken in by the pump 1, A sensor 3 which is attached to the liquid flow path 2 and measures the pH and the like of the sample liquid, a resistance measurement electrode 8 which is provided on the test liquid flow path 2 on a considerably upstream side of the sensor 3, and the test liquid. Based on the measurement results of the resistance measurement electrodes 9 and the resistance measurement electrodes 9 provided in the flow path 2 slightly downstream of the resistance measurement electrodes 8, bubbles and the like are contained in the sample liquid. And a resistance measuring electrode 4 which is provided in front of the sensor 3 in the test liquid flow path 2 and measures the conductivity of the sample liquid guided to the sensor 3. The sensor of the test liquid flow path 2 3 is provided after the sensor 3 and measures the conductivity of the sample liquid discharged from the sensor 3, and the resistance measurement electrodes 5 and 5 are used to measure the conductivity of the sample liquid. When the CPU 6 that determines whether bubbles or the like are included, and the CPU 6 and the CPU 10 determine that the sample liquid does not include bubbles or the like, the measurement result obtained by the sensor 3 is displayed. It is equipped with an analyzer main body 7 that amplifies and outputs to a recorder or display for recording or displaying.

Next, the measurement operation of this embodiment will be described with reference to the configuration diagram shown in FIG.

First, when a measurement command such as PH of the sample liquid is input, the CPU 10 drives the pump 1 to take in the sample liquid and let the sample liquid flow into the test liquid flow path 2, while the two resistances are The conductivity of the sample liquid is measured by the measuring electrodes 8 and 9 to determine whether the resistance value of the sample liquid is smaller than a preset value.

If the resistance value of the sample liquid measured by each of the resistance measuring electrodes 8 and 9 is smaller than a preset value, the CPU 10 determines that the sample liquid is supplied to the sensor 3. When it is determined that air bubbles are not contained, the pump 1 is continuously driven to supply the sample solution to the sensor 3, while outputting a measurable signal to the other CPU 6 and the analyzer main body 7.

As a result, the CPU 6 puts the resistance measuring electrode 4 provided at the front stage of the sensor 3 and the resistance measuring electrode 5 provided at the rear stage of the sensor 3 into a non-voltage state and applies a voltage to the sample liquid. While eliminating the measurement error of the sensor 3 caused by this, an output command is supplied to the analyzer main body 7 to amplify the measurement result obtained by the sensor 3 and output it to a recorder or a display device. To record or display.

Then, in this state, if the resistance value of the sample liquid measured by the two resistance measuring electrodes 8 and 9 provided on the upstream side of the sensor 3 is set in advance and becomes equal to or more than the value, The CPU 10 determines that bubbles or the like are mixed in the sample liquid supplied to the sensor 3, stops the generation of the measurement stop command, and supplies this to the analyzer main body 7 to perform the measurement operation of the analyzer main body 7. The CPU 6 is stopped and the other CPU 6 is started to measure bubbles and the like.

As a result, the CPU 6 applies a voltage to the resistance measurement electrodes 4 and 5 provided in the front and rear stages of the sensor 3, and the resistance value of the sample liquid is applied by these resistance measurement electrodes 4 and 5. When the measurement is started, it is determined whether or not the resistance value obtained by each of the resistance measuring electrodes 4 and 5 is equal to or higher than a preset value.

Then, the resistance value of the sample liquid obtained by the resistance measuring electrode 4 provided in the preceding stage of the sensor 3 becomes equal to or higher than a preset value, and thereafter, the resistance value is provided in the subsequent stage of the sensor 3. When the resistance value of the sample liquid obtained by the resistance measuring electrode 5 becomes equal to or higher than a preset value, the CPU 6 determines that the sample liquid containing the bubbles and the like has completely passed through the sensor 3 portion. Therefore, the resistance measuring electrode 4 provided in the front stage of the sensor 3 and the resistance measuring electrode 5 provided in the rear stage of the sensor 3 are put in a non-voltage state so that an error does not occur in the measurement of the sensor 3. At the same time, an output command is generated and supplied to the analyzer main body 7.

As a result, the analyzer main body 7 resumes its operation, amplifies the measurement result obtained by the sensor 3, and outputs it to a recorder or a display device to record or display the measurement result. I will let you.

As described above, in this embodiment, two resistance measuring electrodes 8 and 9 are provided on the considerably upstream side of the sensor 3, and the sample liquids obtained by the respective resistance measuring electrodes 8 and 9 are When the resistance value exceeds a preset value, a voltage is applied to each of the resistance measuring electrodes 4 and 5 provided in the front and rear stages of the sensor 3 so that the sample liquid containing the bubbles and the like is Since it is detected whether or not it has passed through the sensor 3 part, even if the sample liquid has a characteristic that an error occurs in the measurement of the sensor 3 by applying a voltage to the sample liquid, the measurement error due to bubbles etc. Occurrence can be prevented.

Further, in each of the above-described embodiments, the resistance measuring electrode 4 provided in the front stage of the sensor 3 detects a bubble or the like, and then the resistance measuring electrode 5 provided in the rear stage of the sensor 3 starts. Although the time until the bubbles and the like are detected is not taken into consideration by the resistance measuring electrode 4 provided in the front stage of the sensor 3, the period from the time when the bubbles and the like are detected to the stage after the sensor 3 is detected. When the time "T" until the above-mentioned bubbles and the like are detected by the provided resistance measuring electrode 5 is shorter than the time "T1" corresponding to the discharge flow rate of the pump 1 (T <T1), or each resistance measurement When the resistance value of the sample liquid is detected to be higher than the preset value by any of the electrodes 4 and 5, bubbles in the sample liquid are continuous. Judgment When the condition of “T> T1” is satisfied, or when the resistance value of the sample liquid is low by the resistance measurement electrodes 4 and 5 for a preset time or longer, The analyzer main body 7 may be caused to start the measurement operation by determining that continuous bubbles or the like have passed through the three parts.

Further, in each of the above-mentioned embodiments, the conductivity of the sample liquid is measured to detect the presence or absence of bubbles, but the change in the dielectric constant or the density change is detected to detect the presence of It is also possible to detect bubbles and the like, detect bubbles and the like using ultrasonic waves, and measure bubbles and the like by measuring the amount of transmitted light.

[0032]

[Effect of the device]

 As described above, according to the present invention, it is possible to prevent a measurement error even if a solid matter, air bubbles, or the like is mixed in the sample liquid.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an analyzer according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the analyzer according to the present invention.

FIG. 3 is a configuration diagram showing an example of a conventionally known analyzer.

[Explanation of symbols]

 1 Pump 3 Sensor 4 Resistance Measurement Electrode (Pre-stage Detector) 5 Resistance Measurement Electrode (Pre-stage Detector) 6 CPU (Control Circuit) 7 Analyzer Main Body

Claims (1)

[Scope of utility model registration request] 1. An analyzer for taking in a liquid and measuring a measurement item preset by a sensor, comprising: a pre-detector provided in the preceding stage of the sensor for measuring an item causing a measurement error of the liquid flowing into the sensor. And a rear-stage detector that is provided in the rear stage of the sensor and measures a measurement error cause item of the liquid flowing out from the sensor, and a detection result of the front-stage detector and a detection result of the rear-stage detector based on the detection result of the sensor. An analyzer comprising: a control circuit that determines whether the measurement result is good or bad and outputs only a good part as a measurement result.